Door lock



H. Mc'CARTY.

DOOR LOCK. APPLICATION FILED-JULY 7, I921.

Patented July 18, 1922.

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HOMER BAR IVICCARTY, 0E OGDEN, UTAH, ASSIGNQE TC! 9 K ELEVATQR SAFETYLOCK COMI ANY, OF OGDEN, U'lAI-ll, A GOREDRATION.

DOOR- LOCK.

Application filed July '7,

To all whom it m an copes-mi:

Be it lrnown that l, i-loMn'e Ban Mot/AMY, a citizen of the UnitedStates, residing at Ogden, in the county of Weber and State of Utah,have invented new and useful Improvements in Door Locks, of which thefollowing is a specification.

My invention relates to that class of locks designed especially for usein connection with the landing doors of elevator shafts or wells, andthe primary object of the invention is the provision of a safety devicein connection with the doors of the shaft or well which will preventoperation of the electrically controlled elevator unless the doors areclosed, thus preventing accidents, and insuring that all of the doorswill be closed while the elevator is in motion.

With this object in view the invention consists in certain novelcombinations and arrangements of parts involving electrical connectionswith the power, or control of the electric power circuit for theelevator, asiwill be hereinafter more fully described and claimed.

the door frame is shown in section to disclose the operating partstherein, the door being shown in locked position, and the latch barshown by dotted lines in position to permit opening of the door.

Figure 2 is a transverse sectional view' through the casing and interiorparts, on line 2-42 of Figurel,

Figure 3 is a transverse, horizontal sectional view through the casin'9.

In the preferred form of the invention as illustrated, the metalliclatch plate 1 is attached to the door designated by the letter D, whichdoor is utilized at the opening in the elevator shaft, one for eachfloor of the building, and of the sliding type. The door is accessiblefor opening and closing from the interior of the shaft, or from theelevator, and the plate 1 is attached at the shaft Specification ofLetters Patent.

Patented July 18, T3 22.

Serial No. 482,9?3.

side of the door as shown.- The operating latch bar 2 is of metal andpivoted at 3 within the latch plate at, and the latch bar has a handle 5projecting therefrom to be grasped by the elevator operator formanipulating the lock and also for sliding open or closing the door D.The latch plate is fashioned with an offset guide portion 6 havingangularly disposed guide walls, and the attaching plate 1 is providedwith a guide strap 7 secured thereto by screws for guiding and limitingthe movement of the latch bar as it is swung on its pivot 3. The hook Sfashioned at the end of the latch bar is designed to pass through anopening in the casing 9 and is giiiided therethrough by the beveled edge10 at the mouth of the opening against which the rounded edge 11 of thelatch bar may contact as the latch bar passes through the opening,

The casing 9 is secured in proper position to the frame F of the doorand is provided with a lug 12 for co-action with the latch hook S inholding the door locked when the door is closed. In 'gure i it will benoted that the 1m 7 7 arm of the pivoted latch, at the left of the pivot, is of suiiicieut weight to insure the normal, horizontal positionof the latch bar, in order that the hook 8 may swing up into position asshown to engage the locking lug 12 when the hooked end of the latch isprojected through the opening in the casing, and thus the door isautomatically locked as it slid to closed position.

In cooperation with the locking latch-hook I employ electricalconnections that are included in. the control circuit of theelectrically operated elevator, and these connections are controlled bya gravity operated lgiumper arm which loosely pivoted on a shaft i lsupported in the casing 9, the weight of this bumper arm beingsufficient to swing the arm downwardly when not supported by the hookedend of the latch bar. I

On the same shaft 14 is loosely pivoted a carrier or carrier-arm 15, inthe form of a flat plate of suitable material and disposed above thebumper arm 13 and its weight. At the upper and lower faces of thiscarrier arm are insulation plates 16 and 17 respectively, the lowerplate 17 forming also a wear plate or cushion for the lug 18 on thebumper arm that engages this lower plate and holds the carrier plate inhorizontal position as indicated. The pivoted carrier also has aconductor plate 19 attached at its upper side, screws or bolts 20 andnuts 21 being utilized to secure this plate to the carrier, and thesescrews passing through the conductor plate, insulation plates andcarrier secure these parts together in order that they may swing as arigid member on their pivotal shaft 14.

Near the upper end of the casing 9 is secured an insulated bar 22, whichforms a rigid support for the terminals 23 and 2% of the wires 25 and 26of the electric control circuit for the elevator, the wires being led tothe casing through tubes as 27 in usual manner.

From an inspection of Figure 1 it will be apparent that when the door isclosed the latch-hook S encounters the bumper arm 13 and the latter isswung upwardly on its pivot 14:. As the bumper arm swings upwardly itslug l8 encounters the insulation plate 17 of the carrier, and thecarrier, with its conductor plate 19 is swung upwardly on its pivot iscausing the conductor plate to contact with the ends of the spacedterminal posts 23 and 2-1- to close the circuit of which the wires 25and 26 form a part. While the circuit is closed the control circuit ofthe elevator is operative and the elevator may thus be operated. Whenthe elevator reaches a selected land ing, the handle 5 is grasped by theelevator operator and the latch swung on its pivot 3 and by continuedpower applied to the handle the door is slid to the left in Figure 1 toopen position. The first, pivotal, move ment of the latch bar isindicated by dotted lines in Figure 1 wherein the handle end of thelatch bar has swung upwardly, and the hooked end has turned downwardly,encountering the lug 13 on the casing, and the hook is in position to bewithdrawn through the opening of the casing. lVhen the sup port of thehook 8 has been withdrawn from the weighted bumper arm 13, the latterswings by gravity, downwardly and is stopped by the lug 1.3, where itremains in position closing the opening in the casing and in position tobe engaged by the hooked end 8 when the door is again closed. After thebumper arm has fallen away from supporting position for the carrier arm,the latter also swings by gravity on its pivot R and falls until the endof the carrier 15 encounters the stop 15 fixed at the inner side of oneof the casing walls. The movement of the carrier disengages theconductor eas es plate from the two terminal posts and the circuit isbroken, thus rendering the elevator inoperative until the circuit isagain closed by the action of closing the door I).

From the above description taken in connection with my drawings it willbe apparent that I have provided a safety device for elevators that iscomparatively simple in construction and operation, which may bemanipulated with facility, and which is reliable and efficient in theperformance of its required functions.

javing thus fully described my invention, what I claim as new and desireto secure by Letters Patent is l. The combination with a pivoted doorlatch having a hooked-end, of a casing adapted to receive said hookedend, a weighted bumper arm pivoted in the casing in the path of saidhooked end, a carrier pivoted in said casing and adapted to be helduplifted by said bumper arm, stationary terminal posts within saidcasing forming art of an electrical connection in a control circuit, anda conductor plate on said carrier for contact with said posts.

2. The combination in an elevator door locking mechanism with a fixedcasing and electrical connections therein formingpart of an electriccontrol circuit, of a pivoted door latch having a hooked end to projectthrough an opening in said casing, a gravity operated, pivoted bumperarm within the casing in the path of said hooked end, a pivoted carrierwithin the casing having a conductor plate and terminal posts formingpart of said electrical connections for co-action therewith, and meanson said bumper arm for engaging said carrier to hold the conductor platein contact with said posts.

3. The combination in a door locking mechanism including electricalconnections forming part of a control circuit, of a casing and terminalposts therein, a shaft within the casing, a carrier pivoted on saidshaft and a conductor plate on said carrier ada Jted to contact withsaid osts a wei 'ht l a b ed bumper arm pivoted on said shaft and a lugon said arm to engage and hold said carrier in uplifted position, asliding door and latch bar pivoted thereon, a hooked end on said latchbar adapted to be projected through an opening in said casing, a lockinglug on said casing for the hooked end, and said hooked end adapted tohold said bumper arm and carrier in uplifted position, for the purposedescribed.

HOMER BAR MOCARTY.

